Numerical Modeling and Technico-Economic Analysis of a Hybrid Energy Production System for Self-Consumption: Case of Rural Area in the Comoros

This study aims to provide electricity to a remote village in the Union of Comoros that has been affected by energy problems for over 40 years. The study uses a 50 kW diesel generator, a 10 kW wind turbine, 1500 kW photovoltaic solar panels, a converter, and storage batteries as the proposed sources. The main objective of this study is to conduct a detailed analysis and optimization of a hybrid diesel and renewable energy system to meet the electricity demand of a remote area village of 800 to 1500 inhabitants located in the north of Ngazidja Island in Comoros. The study uses the Hybrid Optimization Model for Electric Renewable (HOMER) Pro to conduct simulations and optimize the analysis using meteorological data from Comoros. The results show that hybrid combination is more profitable in terms of margin on economic cost with a less expensive investment. With a diesel cost of $1/L, an average wind speed of 5.09 m/s and a solar irradiation value of 6.14 kWh/m2/day, the system works well with a proportion of renewable energy production of 99.44% with an emission quantity of 1311.407 kg/year. 99.2% of the production comes from renewable sources with an estimated energy surplus of 2,125,344 kWh/year with the cost of electricity (COE) estimated at $0.18/kWh, presenting a cost-effective alternative compared to current market rates. These results present better optimization of the used hybrid energy system, satisfying energy demand and reducing the environmental impact.

Pros and Cons of Information Teaching——In the Case of the Design of Container Transport

The article is mainly about the advantages and disadvantages of information teaching in the case of a design of Container Transport.Information teaching did bring some good to the teaching,both to the teachers,and the students and class.Yet it did have some side effects.And some suggestions are given to the information teaching to make it better used for teachers and students.

Internet Gaming Disorder and Mental Health of Children in China:A Latent Profile Analysis

In recent years,speculation of an increase in Internet Gaming Disorder(IGD)has surfaced with the growing popularity of internet gaming among Chinese children and adolescents.The detrimental impact of IGD on mental health cannot be denied,even though only a small portion of the screen-dependent population exhibits psychopathological and behavioral symptoms.The present study aimed to explore a latent profile analysis(LPA)of Internet Gaming Disorder on the mental health of Chinese school students.The data were collected from a sample of 1005 Chinese school students(49.8%male;age M=13.32,SD=1.34 years)using a paper-pencil survey through convenience sampling.LPA explored three latent profiles of internet gamers:regular gamers(62.4%),moderate gamers(28.1%),and probable disordered gamers(9.4%).Results showed that the probable disordered gamers had significantly higher levels of depression,anxiety,emotional and conduct problems,hyperactivity,and peer problem symptoms as well as lower life satisfaction,and pro-social symptoms compared to regular and moderate gamers(p<0.05).This study would be helpful to mental health professionals in designing interventions for gamers who present IGD symptoms.Future longitudinal studies should also be undertaken to assess whether mental health worsens for probable disordered gamers.

Constrain-based analysis of gene deletion on the metabolic flux redistribution of Saccharomyces Cerevisiae

Based on the gene-protein-reaction (GPR) model of S. cerevisiae_iND750 and the method of constraint-based analysis, we first calculated the metabolic flux distribution of S. cere-visiae_iND750. Then we calculated the deletion impact of 438 calculable genes, one by one, on the metabolic flux redistribution of S. cere-visiae_iND750. Next we analyzed the correlation between v (describing deletion impact of one gene) and d (connection degree of one gene) and the correlation between v and Vgene (flux sum controlled by one gene), and found that both of them were not of linear relation. Furthermore, we sought out 38 important genes that most greatly affected the metabolic flux distribution, and determined their functional subsystems. We also found that many of these key genes were related to many but not several subsystems. Because the in silico model of S. cere-visiae_iND750 has been tested by many ex-periments, thus is credible, we can conclude that the result we obtained has biological sig-nificance.

Research on the Construction Mechanism of Community Participation Subject from the Perspective of Institutional Analysis

The article combines institutional change and social participation of the subjects. By investigating the expanding of community subject and gradually cultivating their ability to participate,we can test the achievements of community development in our country,and lay a foundation for reaching the social development goals.

Colorectal cancer screening from 45 years of age: Thesis, antithesis and synthesis

Colorectal cancer incidence and mortality in patients younger than 50 years are increasing, but screening before the age of 50 is not offered in Europe. Advancedstage diagnosis and mortality from colorectal cancer before 50 years of age are increasing. This is not a detection-bias effect;it is a real issue affecting the entire population. Three independent computational models indicate that screening from 45 years of age would yield a better balance of benefits and risks than the current start at 50 years of age. Experimental data support these predictions in a sex- and race-independent manner. Earlier screening is seemingly affordable, with minimal impediments to providing younger adults with colonoscopy. Indeed, the American Cancer Society has already started to recommend screening from 45 years of age in the United States. Implementing early screening is a societal and public health problem. The three independent computational models that suggested earlier screening were criticized for assuming perfect compliance. Guidelines and recommendations should be derived from well-collected and reproducible data, and not from mathematical predictions. In the era of personalized medicine, screening decisions might not be based solely on age, and sophisticated prediction software may better guide screening. Moreover, early screening might divert resources away from older individuals with greater biological risks. Finally, it is still unknown whether early colorectal cancer is part of a continuum of disease or a biologically distinct disease and, as such, it might not benefit from screening at all. The increase in early-onset colorectal cancer incidence and mortality demonstrates an obligation to take actions. Earlier screening would save lives, and starting at the age of 45 years may be a robust screening option.

Pros and cons of climate change in China

Climate change strongly affected the structure and functions of natural ecosystems,e.g.the vegetation productivity decreased in the Northeast permafrost region due to the higher temperature and less precipitation,whereas in the Tibetan Plateau,the vegetation productivity increased,owing to the improved thermal resource.Climate change led to reduced precipitation in North and Northeast China and thus the reduced surface runoff.The public needs for energy were changed because of climate change,e.g.the shorter heating period in winter.Climate change profoundly influenced human health,pathophoresis and major projects by increasing extreme events,including frequency and magnitude,and causing more serious water shortage.Under the background of climate change,although the improved thermal resources can be helpful for extending the crop growth period,more extreme events may resulted in more instability in agricultural productivity.Not only did climate change indirectly affect the secondary and tertiary industries through the impacts on agriculture and natural resources,but also climate change mitigation measures,such as carbon tax,tariff and trading,had extensive and profound influences on the socioeconomic system.Further analysis indicated that the impact of climate change presented significant regional differences.The impact had its pros and cons,while the advantages outweighed the disadvantages.Based on the above analysis on the impacts of climate change,we put forward suggestions on coping with climate change.First,scientifically dealing with climate change will need to seek advantages while avoiding the disadvantages of climate change in order to achieve the orderly adaptation to climate change,which is characterized with"Overall best,long-term benefit."Second,quantitative adaptation should be given more attention,e.g.proposing operational schemes and predictable goals and using uncertainty analysis on adaptation measures.Third,more active coping strategy should be adopted to enhance China's future comprehensive competitiveness.The strategies include but are not limited to gradually adjusting the industrial structure,intensifying the research and development(R&D)of emission reduction technology and actively responding to the influence of carbon tax,tariff and trading on socioeconomic development in China.

Distortion Analysis of the Tooth Rack of a Three-Link Gear-reducer

Three-link reducers are widely used in petrochemical, mining and other fields for their high transmission ratio, high capacity and high transmission efficiency. Tooth racks are the key components of a three-link gearreducer. In this paper, in order to obtain the fairly accurate link board stress distribution, we use the PRO/E software to establish the 3D models, carry out theoretical analysis of the link board overall stress and analyze the stress of the tooth rack with ANSYS software.

Mega Container Ships, Pros, Cons and Its Implication Recession

The size of container vessels has grown up in the past ten years and the trend prospect to be continued, according to analysis almost half of current ships order is for vessels exceeding 12,000 TEU＇s. Mega vessels have advantages to liners and for holding down the coast of ocean shipping but also raising concerns among vessel operation, insurance and they require for infrastructure adaptations and productivity level. Moreover further increase in ship size could result negative impacts and crises in recession.

融合高斯白噪声的PROSPECT模型的柑橘叶片叶绿素反演

叶绿素是反映植被光合能力的重要指标。为了建立具有普适性的柑橘叶片叶绿素的反演模型,利用PROSPECT模型建立模拟光谱后采用3种特征选取的方法建模,分别为基于敏感性波段(Sensitivity Band,SA)的特征选取,记为PRO-SA模型;采用竞争自适应加权算法(Competitive Adaptive Weighting Algorithm,CARS)的特征选取,记为PRO-CARS模型;采用连续投影算法(Successive Projection Algorithm,SPA)的特征选取,记为PRO-SPA模型。结果表明,①PRO-SPA模型为最优反演模型,其决定系数R^(2)相较原始光谱提升了0.07;②在最优PRO-SPA模型中重采样并对模拟光谱进行多元散射矫正(Multiple Scattering Correction,MSC)后加入高斯白噪声,加入信噪比为80 dB的高斯白噪声的模拟光谱在PRO-SPA模型中表现出最优的反演精度,其决定系数R 2为0.6903,均方根误差(Root Mean Square Error,RMSE)为12.98,相比较原始光谱反演提升了0.15,表明了该方法对于柑橘叶片的光谱模拟以及叶绿素反演的可行性。

High Hopes Being tall has its pros and cons

In China the desire to be taller is high （excuse the pun）, despite people＇s genetic make-up. It＇s a desire driven by the sheer volume of folk competing for partners, promotions and prime job offerings, where any advantage is sought in order to get a foot in the door. And with the vast numbers of job seekers competing for positions, recruiters behind those doors can afford to be picky. The word on the street is height means rapid advancement through the ranks. Many young professionals hold the common belief that taller people have more opportunity for promotion in the desperate climb up the corporate ladder.

A Comprehensive Economic Assessment of Producing Biodiesel Derived from Used Cooking Oil Using the BioPro380 EX

The authors performed economic assessment of producing biodiesel at pilot scale using used cooking oil as feed-oil in a Bio-Pro 380 EX biodiesel reactor. The overall results suggest that the biodiesel production using used cooking oil is a viable project even at large or medium scale. The payback period for producing biodiesel at a pilot scale of 31,320 liters per year was 1.5 years, which was 1 month longer than the payback period for a large plant capacity of 66,000 liters per year. The study demonstrated that the unit selling price and unit production cost are sensitive to the economic feasibility of biodiesel production, since price variations of BWP 1 result in at least a 13% increase and 12% decrease in profit, respectively. The study further revealed that feed-oil (used cooking oil) was the most expensive among all the inputs accounting for 61%, followed by methanol and direct labour with 19% and 13% respectively. The overall energy recorded to produce approximately 360 liters of biodiesel contributed to 2% only, suggesting that Bio-Pro 380 EX biodiesel reactor is relatively a low energy intensity processor. The situation is suitable for the promotion of biodiesel particularly in countries where initiatives to stimulate the development of biofuels are at its infant stage Botswana included.

TOLERANCE ANALYSIS OF A PLANETARY GEAR REDUCER UNDER CAD CIRCUMSTANCE

Tolerance analysis of a planetary reducer is conducted. By focusing the serially-arranged parts in the central line and setting an appropriate dimension as a “gap”, worst-case tolerance analysis method and statistical （RSS） tolerance analysis are used, and then a tolerance-analyzing tool CE/TOL is introduced. The acceptable value range of the “gap” is from 1.5 mm to 3.5 mm. While worst-case analysis rejects the design, RSS accepts it by a more realistic result with the law of probability accounted. With the help of CE/TOL and CAD software Pro/E, all components＇ dimensions and tolerances are assigned and modified, and more detailed and more comprehensible results are gives out.

Comparison between Different Shapes of Structure by Response Spectrum Method of Dynamic Analysis

Several procedures for non-linear static and dynamic analysis of structures have been developed in recent years. In this paper, the response spectrum analysis is performed on two different shapes i.e. regular and irregular shape of structure by using STAAD PRO. And the comparison results are studied and compared accounting for the earthquake characteristics and the structure dynamic characteristics. As the results show that the earthquake response peak values and the main response frequencies are very close and comparable. It can be referred to by the engineering applications.

Pros & Cons

PRO Chen Wei University student Civil servants deserve job security and more career options.Many current civil servants are well-educated and hold master＇s or even doctorate degrees.If they are offered other career opportunities, they may achieve greater success.It is often the case that capable graduates working in civil service can＇t get promoted despite putting in years of hard work. These individuals are passed over for promotion not because they are incompetent or not dedicated to their jobs.

降雨作用下考虑结构面劣化的边坡块体稳定性评价

降雨是诱发边坡失稳,发生崩塌、落石、滑坡的一个主要诱因,降雨作用下结构面强度会发生劣化,导致边坡块体失稳塌落,引起地质灾害,对人民生命财产构成严重威胁。基于离散元数值分析方法,考虑降雨作用对结构面抗剪强度的影响,分析结构面强度参数劣化及孔隙水压力变化规律,建立抗剪强度劣化模型;结合坐标投影原理提出考虑降雨作用下结构面强度劣化效应的块体稳定性系数计算方法;基于有限元分析方法研究降雨强度与降雨历时对岩质边坡块体稳定性的影响,并进一步分析稳定性系数与降雨强度及降雨历时的关系,提出降雨作用下考虑结构面劣化的边坡块体稳定性评价方法。研究表明,不同含水率作用下结构面的抗剪强度劣化不仅受黏聚力和内摩擦角影响,还与孔隙水压力有关,针对单滑面和双滑面型块体构建了考虑结构面降雨劣化的稳定性分析数学模型,提出的以降雨时长、降雨强度和块体稳定性关系曲线的共同评价体系可为边坡块体稳定性评价提供科学依据,并推动边坡地质灾害防治和工程建设发展。

滇西深度贫困地区旅游扶贫绩效的实证研究

为了能够更加清晰和可量化审视旅游业发展对贫困地区、贫困人口的经济、社会和生态影响,本文运用多元统计分析方法对滇西10个州市旅游扶贫绩效进行实证分析.通过结合当地经济发展主要指标和其他基础条件,构建科学适用的旅游扶贫绩效评价指标体系,据此对滇西深度贫困地区进行综合评估分析,为当地产业发展衔接乡村振兴策略的制定提供定量依据.

基于迭代重建算法的iDream重建技术对CT定量分析肺功能的影响研究

目的:探究不同iDream重建等级(1、3、5级)对CT定量分析肺功能参数的影响,为临床应用iDream重建技术定量测量肺气肿指标提供参考。方法:回顾性选取2021年12月至2022年1月在某院行胸部CT平扫的50例患者,分别使用滤波反投影(fittered back projection,FBP)、iDream 1级、iDream 3级、iDream 5级4种方法重建图像。测量4组图像的主气管CT值和标准差(standard deviation,SD)值并计算图像信噪比(signal to noise ratio,SNR),使用肺功能定量分析软件测量4组图像的双肺总容积(total lung volume,TLV)、肺气肿容积(emphysema volume,EV)、肺气肿指数(emphysema index,EI)、15%肺衰减值(15th percentile of lung attenuation,Perc 15)、15%肺质量(pulmonary density 15%,PD15%)。采用SPSS 22.0统计学软件进行数据对比。结果:4组间图像主气管CT值、TLV比较,差异无统计学意义(P>0.05),4组间SD、SNR、EV、EI、PD15%、Perc 15比较,差异有统计学意义(P<0.05)。随着iDream重建等级的增高,主气管SD值、EV、EI逐渐降低,iDream 3级组与iDream 5级组EV、EI比较,差异无统计学意义(P>0.05);随着iDream重建等级的增高,PD15%、Perc 15逐渐升高,iDream 3级组与iDream5级组PD15%、Perc 15比较,差异无统计学意义(P>0.05)。结论:随着iDream重建等级的增高可降低图像噪声,影响CT定量分析肺功能结果,iDream 3级和iDream 5级可保证EV、EI、PD15%、Perc 15相对稳定,不受迭代重建算法强度影响。

中古时期欧洲建筑阶段性亲自然特征辨析

近年来,双碳“1+N”政策体系逐步构建完成,从亲自然视角出发探析代表性建筑的亲自然特征,有益于为当代低碳建筑提供新的设计思路。中古时期是欧洲建筑的类型、艺术、技术取得巨大突破的重要时期,是建筑与自然关系发生转变的重要节点。以威廉姆·布朗宁(William Browning)提出的14项亲自然设计模式为基础,翻阅相关文献资料,梳理中古时期欧洲建筑发展的历史进程,结合亲自然设计模式中“空间中的自然模式”“天然类似物模式”“空间的本质模式”三类,对中古时期欧洲代表建筑亲自然特征进行归纳,探析不同影响因子作用下的亲自然影响效应,提炼其中经验智慧,最后形成“双碳”背景下的亲自然设计建议。

矿渣微粉改良红层填料的力学特性及其机理分析

为研究矿渣微粉改良红层填料的力学特性及其作用机理,通过无侧限抗压强度、直剪等试验,对不同矿渣微粉掺量下的红层填料进行了强度特性分析,并采用X衍射、热重分析、红外光谱、激光粒度、核磁共振和扫描电镜等微观分析方法,围绕矿渣微粉改良土体的作用机理进行了研究。试验结果表明,矿渣微粉对红层填料的力学强度和水稳定性具有较好的改良作用,改良填料的无侧限抗压强度由0.76 MPa逐渐增大至3.10 MPa;黏聚力与内摩擦角也得到了显著提高。通过红外光谱、激光粒度和核磁共振分析发现,改良填料颗粒间Al^(3+)阳离子配位的振动峰增强,降低了黏土矿物的双电层厚度,土颗粒团聚性显著增强,孔隙分布得到优化;通过X射线衍射和热重分析证明了水化产物的生成过程;扫描电镜观测到改良填料的具体作用机理:主要为填充效应和胶凝效应,其胶凝效应包括水化作用和离子交换作用。对微观扫描图的定量化分析进一步表明土体结构复杂程度增大,颗粒粗糙程度及骨架性增强。